Agate Quartz
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Quartz is silicon dioxide, SiO2. Agate is a variety of quartz showing dramatic crystal growth patterns. The sample at right is about 14x14 cm and is from Laguna Ranch, Chihuahua, Mexico. |  |
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 |  This specimen of agate is about 20x18 cm and is from Brazil. |
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This specimen of agate with manganese oxide is about 4x5 cm and is from India. |  |
 |  This specimen of agate is about 8x8 cm and is from Brazil. |
 This specimen of agate is about 16x14 cm and is from Pequot Lakes, Crow Wing County, Minnesota. |  |
| Minerals |
| HyperPhysics***** Geophysics | R Nave |